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W. THOMAS.

SPEAKING TUBE MOUTH-PIECE. :NO. Z92,387. Patented Jan. 22, 1884.

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UNITED STATES PATENT XVILLIAM THOMAS, OF PITTSTOX, PEXKSYLVAXIA.

SPEAKING-TUBE MOUTH=PIEC L SPECIFICATION forming part of Letters PatentNo. 292,387, dated January 2?, 1884.

Application filed November 26, 1883.

I0 aZZ whom it may concern.-

Be it known that I, WILLIAM Trroinis, of Pittston, in the county ofLuzerne and State of Pennsylvania,have invented a new and ImprovedMouth-Piece for Speaking-Tubes, of which the following is a full, clear,and exact description.

The object of my invention is to provide a new and improved mouth-piecefor speakingtubes, which mouth-piece is so constructed that the leastcurrent of air in the speakingtube will blow the whistle.

The invention consists in a cylindrical casing containing a swingingpiece carrying a whistle, and having its outer end curved to fit wellagainst the inner surface of the cylinder.

The invention also consists in a central shaft in the casing, whichshaft is acted on by a spring, and has arms carrying the swinging piece.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a face view of my improved mouthpiece for speaking-tubes.Fig. 2 is a longitudinal sectional elevation of the same on the line m.r, Fig. 1. Fig. 3 is a plan view of the same, the top plate beingremoved. Fig. 4 is a rear view of the plate carrying the whistle.

At the front of a cylindrical casing, A, a funnel-shaped mouth or bell,B, is formed, and on the rear end of the casing a threaded neck, 0, isformed for screwing the mouthpiece to the end of the speaking-tube D.The casing A is provided with removable top and bottom pieces, E and F,respectively, in which top and bottom pieces a vertical spindle orshaft, G, is journaled, which is provided at its upper end with acrank-handle, H. A spring, J, having one end secured to the shaft G, iswound around the said shaft, and has its upper end secured on the underside of the top plate, E. Two arms, K, project from the shaft G, and onthe outer ends of the said arms an upright piece, L, is held, which isprovided with a central aperture, M, and has its outer surface roundedtransversely to fit closely and snugly against the (No model.)

inner surface of the cylindrical casing A. A whistle, X, of the usualconstruction, is held over the aperture M on the innersurface of thepiece L. Two cheek-studs, a and b, project from the upper surface of thebottom piece, F, against which studs the bottom arm, K, and the piece Lcan strike to limit the movements of the said piece L. The piece L isheld loosely on the ends of the arms K, and thus prevents the curvedsurface of the piece L from working with too much friction against theinner surface of the casing, and if there is any lost motion between thepiece L and the inner surface of the casing A, the pressure of thecurrent of air in the tube can press the piece L against the innersurface of the casing A, thus preventing an escape of air, and causingthe whistle to be sounded by the least current of air in the tube. Thespring J holds the whistle N across the inner opening of the bell-mouth,and if the tube is to be used for speaking, the piece L, carrying thewhistle, is swung to one side by means of the crank-handle H. The bottomof the casing is provided with an aperture, (Z, through which water thataccumulates in the said casing can flow off.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. A speaking-tube mouth-piece consisting of a cylindrical casingprovided with a central shaft or spindle carrying a swinging piece, inwhich the whistle is fastened, substantially as herein shown anddescribed.

2. In a speaking-tube mouthpiece, the combination, with a cylindricalcasing, of a-central spindle provided with arms, a piece held loosely onthe arms, and of a whistle held in the said piece, substantially asherein shown and described.

3. In a speaking-tube mouth-piece, the combination, with a cylindricalcasing, of a swinging piece loosely secured to a central shaft, andcarrying a whistle, which swin ing piece has its outer surface roundedto nt closely against the inner surface of the casing, sub stantially asherein shown and described.

4. In a speakingtube mouth-piece, the combination, with a cylindricalcasing, A, of the LJI shaft or spindle G, jonrnalcd 1'11 the top and theSpring J the arms K on shaft G, and at bottom plates, and having arms Kat right a-nright angles thereto, the whistle N, held in the IO glcs toit, the spring J, the piece L, held 011 piece L, and of thechcck-studs aI), substanthe arms, and the whistle N, held in the piece tially asherein shown and described.

5 L, substantially asherein shown and described. "WILLIAM THOMAS.

5. Ina speaking-tube 1n onth-piece, the coml Vv'il'nesscs:

bination, with the cylindrical casing A, of the P. FENN, shaft G,journaledin thetop andbottoni' plates, J. B. GORMAN.

